Re: Attempt to send email using AWS results in Socket closed by peer

[Juan Rayas <juan.m.rayas@gmail.com>]

On Friday, September 3, 2021 at 1:59:33 AM UTC-7, Doctor Who wrote:
> On Fri, 3 Sep 2021 09:32:27 +0200, "Dmitry A. Kazakov" 
> <mai...@dmitry-kazakov.de> wrote: 
> 
> >On 2021-09-03 00:19, Randy Brukardt wrote: 
> >> "Dmitry A. Kazakov" <mai...@dmitry-kazakov.de> wrote in message 
> >> news:sgol48$r20$1...@gioia.aioe.org... 
> >> ... 
> >>> Most mail servers do not accept unencrypted connections. 
> >> 
> >> That's news to me, as my mail server (you know, the one that runs 
> >> Ada-Comment and the other ARG lists) doesn't support encrypted connections. 
> >> I don't have any problem sending to GMail (I send copies of most of my 
> >> personal mail there). Something else must be wrong. 
> > 
> >The question is with what settings. There are hundreds of combinations 
> >of Port x unencrypted|StartTLS|TLS x authentication method. 
> > 
> >The port 465 was intended for TLS, then it was depreciated. Then they 
> >introduced other ports. Legacy mail servers pissed that all on etc. 
> > 
> > From experience, getting a SMTP client working is real pain.
> he is better off using his own provider's mail server on port 25, it 
> will accept username/password as authentication.
Hi all,

 thank you for your comments and responses.

I tried changing the port number to 25, using the default port number in the SMTP.Client.Initialize procedure, and using other port numbers such as 587. I even tried just initializing the SMT server and sending the email (without authentication) as indicated in https://docs.adacore.com/aws-docs/aws/working_with_mails.html.

In all cases, I get the following error:

Can't send message :530 5.7.0 Must issue a STARTTLS command first. u7sm5705829pju.13 - gsmtp

The problem is I don't know how to send the STARTTLS command with AWS. Anyone know how?

My past experience was mostly with real-time embedded systems, so I don't have a lot of experience with email servers. I didn't expect this to be so difficult. Since this was mostly a toy to learn Ada, I may move on to other aspects of Ada for now.

Thanks for all your comments.
--Juan